Simplified version string functions.

src/x11_init.c

@@ -788,7 +788,7 @@ void _glfwPlatformTerminate(void)
 
 const char* _glfwPlatformGetVersionString(void)
 {
-    const char* version = _GLFW_VERSION_NUMBER " X11"
+    return _GLFW_VERSION_NUMBER " X11"
 #if defined(_GLFW_GLX)
         " GLX"
 #elif defined(_GLFW_EGL)
@@ -806,7 +806,5 @@ const char* _glfwPlatformGetVersionString(void)
         " shared"
 #endif
         ;
-
-    return version;
 }